Some figures:
Launch was at 4.14pm.
G1 GPS malfunctioned at 18286 metres.
G1 GPS recovered at 15101 metres.
G1 reported a minimum temperature of -11 degrees Celsius.
First landing SMS received at 1700 metres.
Miscellaneous ideas and thoughts:
Fin to stabilise spin.
Much longer tether (slow the rate of oscillation).
Tie everything down.
- piece of cardboard with velcro for all components
- use a block of foam and only carve out spaces you need
Shock absorber (piece of elastic) between payload and parachute.
Tracker should be logging its GPS data
Android app should auto-start after phone power loss